KR880005610A - Position control system for information storage system - Google Patents

Abstract

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Description

Position control system for information storage system

Since this is an open matter, no full text was included.

4 is a diagram of one embodiment of an optical disk system of the present invention;

5 is a diagram illustrating a relationship between the block diagrams of FIG.

6 is a stepping motor driving circuit diagram shown in FIGS. 4 and 5. FIG.

Claims (18)

A rotating record carrier having a plurality of tracks, a lead-ride head capable of traversing the tracks, a beam reflector mounted on the head and in the vicinity of the record carrier and movable to track a plurality of tracks, the tracks A position control system for an information storage system comprising a DC motor coupled to the beam reflector for driving the beam reflector to track onto a head and a stepping motor coupled to the head, the master control means operatively connected to a host controller. A stepping motor control means operatively connected to the master control means and the stepping motor, a track servo control means operatively connected to the master control means and the DC motor, and a seek command from the host control device. Receiving and activating the stepping motor control means during seek operation. The key controls the stepping motor in response to a driving command from the master control means until the master control means and the head moved by the stepping motor reach a position near a target track on the recording medium. The stepping motor control means for driving with current, in the tracking operation after the seek operation, the master control means changes the mode of the stepping motor control means to the tracking operation and activates the trap servo means, and the target The track servo control means drives the DC motor in response to a position error of the head in the target black in order to accurately control the position of the head on the track, and the position of the beam reflector is controlled by the track servo control means. When the beam reflecting device is beyond the control range of the beam reflecting device At a predetermined angle with a low driving current said stepping motor control means for the position control system is configured as such for driving the stepping motor to compensate for the value. The method of claim 1, wherein the beam reflector tracks a plurality of tracks within the control range in response to successive lead or write commands for a plurality of tracks from a host controller and a predetermined master controller. And the track servo control means continuously drives the beam reflector through the DC motor. 2. The position control system according to claim 1, wherein in the tracking mode, the stepping motor control means and the track servo control means can operate independently and simultaneously. 4. The low drive current as claimed in claim 3, wherein the acceleration applied to the head by driving the stepping motor permits continuous servo control of the track servo means to follow the head. Position control system The position control system according to claim 1, wherein the predetermined rotational angle of the stepping motor is defined by a phase number of the stepping motor and a driving method for the stepping motor. 6. The position control system according to claim 5, wherein the stepping motor is constituted by a two-phase stepping motor, the driving method is a 1-2 phase excitation method, and the rotation angle is 45 degrees. The stepping motor according to claim 5, wherein the stepping motor is constituted by an n-phase stepping motor, the driving method is a microstep driving method m, and the rotation angle is (90 ° / m) × (2 / n Position control system. The position control system according to claim 1, wherein the large driving current supplied to the stepping motor in the seek operation is defined such that the seek time is minimized with the maximum amplitude supplied to the step motor. 9. The position control system of claim 8, wherein the large drive current is further defined such that the movement of the head is smooth. The stepping motor control means according to claim 9, wherein the stepping motor is constituted by a multi-phase stepping motor, wherein the stepping motor is smoothly driven and the sheet tile is minimized. Position control system for driving the stepping motor. 2. The information storage system of claim 1, wherein the information storage system comprises a rotating optical disk, an optical lead-light head, an objective lens mounted on the optical disk, a DC motor connected to the objective lens, and a stepping motor connected to the head. Position control system that is an optical disk system. 12. The position control system of claim 11, wherein the DC motor comprises a voice coil motor. 12. The optical disc system of claim 11, wherein the optical disk system optically detects the position of the focused light beam from the objective lens to the track and converts the optically sensed signal into an electrical signal fed back to track servo control means. Position control system further comprising a position sensor. 14. The stepping motor control means of claim 13, wherein the optical disk system further comprises a second position sensor for detecting a control range state of the track servo control means. Position control system for driving the stepping motor at a low speed at a predetermined rotational angle in a direction. 15. The apparatus of claim 14, wherein the track servo control means includes a DC motor control device and a track servo device, the DC motor control device operating in the tracking mode and giving the target track. Can be converted to the track servo device in response to the successive lead or write commands for multiple tracks, and in response to the position signal from the first position sensor means, the track servo device is passed through the DC motor at the target track. Position control system for performing the position control of the objective lens. The position control system of claim 15, wherein said second position sensor means detects a state of a control signal from said track servo device to said DC motor. 15. The device of claim 14, wherein the stepping motor control means comprises a first control means, a second control means, a drive circuit arrangement having at least one drive circuit connected to a coil of the stepping motor, ie the head The first control means for driving the stepping motor with a large drive current output from the drive device in the seek mode to move near the target track, the step with a low drive current at the predetermined rotational angle in the direction; The drive circuit for outputting the large drive current or the low drive current in response to the second control means for driving a ping motor, a control signal from the first control means or a second control signal or another control signal from the second control means; Including position control system. In the position control system, the first control object, the second control object installed on the first control object, a DC motor connected to the second control object to move the second control object, a stepping motor connected to the first control object, in the first operation mode Long distance control means operatively connected to the stepping motor for driving the stepping motor for moving the first control object at a long distance at high speed, and controlling the position of the second control object in the second operation mode and operating on the DC motor. Servo-control means connected to the step, and operatively connected to the stepping motor capable of operating independently of the servo-control means, and beyond the control range of the servo-control means to compensate for the position error of the servo-control means. In the second operation mode when standing up At a low speed by an angle position control system, consisting of a short-range control means for driving the stepping motor. ※ Note: The disclosure is based on the initial application.